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首页> 外文期刊>Weed Technology: A journal of the Weed Science Society of America >Influence of Increasing Common Ragweed (Ambrosia artemisiifolia) or Common Cocklebur (Xanthium strumarium) Densities on Forage Nutritive Value and Yield in Tall Fescue Pastures and Hay Fields
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Influence of Increasing Common Ragweed (Ambrosia artemisiifolia) or Common Cocklebur (Xanthium strumarium) Densities on Forage Nutritive Value and Yield in Tall Fescue Pastures and Hay Fields

机译：高羊茅草和干草田中豚草（Ambrosia artemisiifolia）或鸟蛤（Xanthium strumarium）的密度增加对牧草营养价值和产量的影响

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Separate field trials were conducted in 2007 and 2008 to investigate the effects of increasing densities of common ragweed or common cocklebur on total yield and forage nutritive values in tall fescue pastures. Common ragweed densities ranged from 0 to 188 plants m(2), and common cocklebur densities ranged from 0 to 134 plants m(-2). Total biomass yields (weeds plus tall fescue) were determined in response to each weed density and species; pure samples of tall fescue, common ragweed, or common cocklebur were also hand collected from each plot at the time of the total biomass harvest. Near-infrared spectroscopy was used to predict crude protein (CP) concentration and in vitro true digestibility (IVTD) of the total harvested biomass, pure tall fescue, and pure weed species in each plot. Results indicate that biomass yields may increase by as much as 5 kg ha (1) with each additional common ragweed plant m (2) within a tall fescue stand. Additionally, CP concentration of the total harvested biomass, pure weed species, and tall fescue decreased by 0.2 to 0.4 g kg(-1) with each additional increase in common ragweed or common cocklebur plant per m(-2). As weed densities increased, IVTD of pure tall fescue samples increased only minimally (0.04%), regardless of the weed species. An increase in common ragweed density also resulted in the CP concentration of pure samples of common ragweed to decrease by 0.2 g kg(-1) for each additional plant per m(2) and by 0.4 g kg(-1) for each additional common cocklebur per m(2). Overall, results from these experiments indicate that plant biomass yield and nutritive values of the total harvested biomass are only marginally influenced by increasing common ragweed or common cocklebur densities.
机译：在2007年和2008年进行了单独的田间试验，以调查密度较高的豚草或普通鸟蛤对高羊茅草牧场的总产量和饲用营养价值的影响。常见的豚草密度范围从0到188植株m（2），常见的鸟蛤密度范围从0到134植株m（-2）。根据每种杂草的密度和种类确定总的生物量产量（杂草加高羊茅）。在收获总生物量时，还从每个地块中手工收集了高羊茅，普通豚草或普通鸟蛤的纯样品。使用近红外光谱法预测每个样地中总收获生物量，纯高羊茅和纯杂草物种的粗蛋白（CP）浓度和体外真实消化率（IVTD）。结果表明，在高羊茅草架上，每增加一种常见的豚草植物m（2），生物量单产可能增加多达5 kg ha（1）。此外，总收获的生物量，纯杂草种类和高羊茅的CP浓度每m（-2）降低了0.2到0.4 g kg（-1），普通豚草或普通鸟蛤植物每增加一次。随着杂草密度的增加，无论杂草种类如何，纯高羊茅样品的IVTD仅微增（0.04％）。普通豚草密度的增加还导致普通豚草的纯净样品的CP浓度每m（2）每增加1株植物就降低0.2 g kg（-1），每增加1株普通草就降低0.4 g kg（-1）每m的鸟蛤（2）。总体而言，这些实验的结果表明，植物豚草的产量和总收获生物量的营养价值仅受到普通豚草或普通鸟蛤密度增加的轻微影响。

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